<script lang="ts" setup name="GoodsImage">
import { computed, ref } from 'vue'
import { useMouseInElement } from '@vueuse/core'
defineProps<{
  images: string[]
}>()
const activeIndex = ref(0)
const target = ref(null)
const { elementX, elementY, isOutside } = useMouseInElement(target)
// 计算鼠标位移的距离
const position = computed(() => {
  let x = elementX.value - 100
  let y = elementY.value - 100
  // 限制滑动的上下左右的区域
  if (x <= 0) x = 0
  if (y <= 0) y = 0
  if (x >= 200) x = 200
  if (y >= 200) y = 200
  return { x, y }
})
</script>
<template>
  {{ elementX }} {{ elementY }}
  <div class="goods-image">
    <!-- 右侧展示大图的容器 -->
    <div class="large" v-show="!isOutside"
      :style="[{ backgroundImage: `url(${images[activeIndex]})`, 
      backgroundPosition: `${-position.x * 2}px ${-position.y * 2}px` }]">
    </div>
    <div class="middle">
      <!-- 左侧展示的大图 
          跟随思路: 鼠标移动时间 实时获取鼠标的位置 修改遮罩的left和top值
      -->
      <img :src="images[activeIndex]" ref="target" />
      <!-- 小遮罩 -->
      <div class="layer" v-show="!isOutside" :style="{ left: position.x + 'px', top: position.y + 'px' }"></div>
    </div>
    <!-- 右侧图片列表 -->
    <ul class="small">
      <li @mouseenter="activeIndex = index" v-for="(item, index) in images" :key="item"
        :class="{ active: index === activeIndex }">
        <img :src="item" alt="" />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;

  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;

  }

  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;

    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0, 0, 0, .2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }

  .small {
    width: 80px;

    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;

      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>